Escapement mechanism for typewriters



Oct. 6,1925- 1,556,441 O. A. HOKANSON I ESCAPBMENT MECHANISM FOR TYPEWRITER 5 Filed Aug. 25, 1921 3 Sheets-Sheet 1 IIIIIIIIII'IIIIIIIII.

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WQAMW Oct. 6, 1925- .nD-L

ESCAPEMENT MECHANISM FOR TY PEWRITERS Filed Aug. 25, 1921 3 Sheets-Sheet 2 oct- 6,

o. A. HOKANSON ESCAPEMENT MECHANISM FOR TYPEWRITERS Filed Aug. 25, 1921 3 Sheets-Sheet a Patented Oct. 6, 1925'.

UNITED STAT-Es v 1,556,441 PATENT OFFICE.-

' o'rro A, HOKANSON, or woonsrocx, ILLINOIS, ".assrenon TO woons'rocir TYPE- WRITEB'COMPANY, or WooDs'rooK, ILLINOIS, A CORPORATION or ILLINOIS.

ESCAPEMENT MECHANISM FOR TYPEWRITERS.

Application filed August 25, 1921. SeriaINo. 495,331.

To aZZrwhom it may concern:

Be it known that I, OTTO A. I-IoKANsoN, a citizen of the United States, residing at Woodstock, in the county of McHenry and .State of Illinois, have invented certain new and useful Improvements in Escapeme nt'. which the the following specification, and it is more.

particularly claims.

In the drawings' I. Fig. 1 is a vertical sectional view of a por-. tion-of a typewriter having one embodiment of the present invention applied thereto;

pointed out in the appended Fig. 2is a vertical section substantially on;

line 2-2 of-Fig. 1; and 1 Fig. 3 is a horizontal section substantially on line 33 of Fig.2.

The main frame of the typewriter is designated by the numeral and carries a platen carriage frame 11 Supported on two arms 12 which are pivoted at 13 on the oppo-' site sides of the main frame 10. A platen carriage 14 is supported by ball bearings 15 which travel in ways 16 on the platen carriage frame. A rack 17 is secured to the pla- 4- ten cariage 14 by lever arms18'having a finger piece 19 by means of whichthe rack may be swung into and out of engagement with a pinion 20. The pinion 20 is secured toa stud shaft 21 journaled inthe carriage frame 11 and provided'at its lower end with: an escapement wheel 22.- Any usual spring mechanism may be provided for drawing the carriage along its ways 16. The movement of the carriage is controlled by the escapement wheel 22 which is provided with a fixed dog 23 and a pivoted dog 24. The fixed dog 23 is formed integrally with a rockerplate 25 which is supported by pivot pins 26 threaded in cars 27 which extend downwardly from a The invention has for its object the pro bracket 28 carried on the lower face of the platen carriage frame 11. I

The movable dog 24has a pin and slot connect1on30 with the rocker plate/25 and a spring 31 normally draws the dog toward the teeth of the escapement wheel 22. A stop 32 is provided. for limiting the movement of the dog upon its pivot. A retainer strip 33 is riveted to the lower side of the rocker plate 25 and bears against the lower face of the movable dog 24 to hold it in place on the rocker plate.

The bracket 28 is provided with a downwardly bent tongue 34 forming a stop for limiting the upward movement'of the rocker plate. The position of this stop may be adjusted by bending thetongue 34 one way or the other. A spring 35 is seated in a depression 36 .in the bracket 21 and presses the rockeriplate 25' against the stop 34. An adjustable stop screw 37 limits the movement ofthe rocker plate in the opposite direction.

. The plate 25 is actuated by an oscillating member 38 pivoted at 39 on the lower face of the platen carriage frame 11. A finger 40 of the oscillating member 38 extends beneathfan offset flange .41 on the tailpiece of the rocker plate 25. A stop screw 42 is threaded in a lug 43 projecting from theoscillating'member 38 for limiting the movement of the member in clockwise direction, as viewed in Fig. 2. link 44 is provided with a goose-neck portion 45 which is pivoted tov the oscillating member 38 at 46. The op' .posite end of the link 44 is pivotally connected' at 47 to a bell crank lever 48 pivotally mounted at.49 on a bracket 50 secured to the lower face of the platen carriage frame 11. The bell crank lever 48 is operated by a' link 51 "extending forwardly substantially parallel to the arm 12 to a point adjacent the pivot 13. The forwardend of the link 51 is pivoted at 52 to an arm 53 extending up- "wardly from a yoke 54 pivotally mounted vona stud .55. A spring clip '56 engages a" groove in the periphery of the pivot 52 to hold the link 51 in pivotal engagement with the arm 53.

. Theyoke 54' adjacent the end of the stud 55 is provided with a downwardly extending arm 57 to the lower end of which is pivotallyconnected a link 58. The. opposite end of the link 58 is pivoted to an upwardly extendingarm 59 of a bell crank lever 60 having a rearwardly extending arm 61. A link 62 connects the arm 61 with a universal bar 63 of the typewriter which extends trans versely of the machine in position to be engaged by the key levers 64: when they are depressed. An oscillatory bar 65 has each end thereof journaled at 66 in the "frame Whenever a key lever is depressed the motion imparted to the universal bar 63 will be transmitted through the link mechanism described to the oscillatory member 68 moving the finger d0 upwardly into contact with the flange 41, thus operating the rocker plate to actuate the escapement dogs 23 and 24 and permit the escapement wheel 22 to rotate an amount equal to one tooththereon. It will be apparent that the parts can be proportioned to time the movement of the escapement wheel properly relative to the movement of the type bars.

l Vhen the platen carriage frame is moved about its pivot 13 into folded position the link 51 will swin about its pivot 52 and the operative connection bet-ween the universal' bar. 63 and the escapement mechanism will remain intact independently of the position of the platen carriage frame. It is thus unnecessary to provide any releasable connection between the escapementmechanism on the platen carriage frame and its actuating means on the main frame, the connection being undisturbed by the folding operation of the typewriter.

For letter spacing independently of the type bars the ordinary spacing bar is provided which is attached to a pair of levers 1 carried on a cross-bar 72 pivoted in the side plates of the main frame. T he rear end of one of the levers 71 enters a slot in the bar 73 mounted to slide vertically on the face of the rear frame plate. .The upper end of the bar 73 is provided with a for-,

wardly projecting flange 74 which extends beneath the tail piece of the rocker plate 25, as shown in Fig. 2. Pressure on the space bar will thus lift the tail of the rocker plate and operate the escapement dogs to permit a letter spacing movement of the platen arriage.

I claim 1.1 In a typewriter, a main frame, a platen carriage frame pivotally mounted thereon, escapement mechanism mounted on said platen carriage frame, key levers mounted on said main frame, and link mechanism for actuating said escapement mechanism from said key levers, said link mechanism having a pivotal connection therein arranged in approximate alinement. with the pivot of said platen carriage frame to permit movement of said platen carriage frame while preserving the continuity of saidlink mechanism.

2. In a compactible typewriter, a main frame, a platen carriage frame pivotally mounted thereon for movement into and out of operating posit-ion, escapement mechanism carried by said platen carriage frame, key levers on said main frame, a non-sepa- 'ating folding openative connection between said hey levers and said escapement mechanism for operating said escapemen mechanism, and letter spacing means for operating s cscapen'ient mechanism independently of said connection between said hey levers and said escapenient mechanism.

3. In a compactible typewriter, a main frame, a platen carriage frame pivoted on said main frame for movement into andout of operating position, escapementmechanism on said platen carriage frame, key levers on said main frame, foldable connecting means I between said hey levers and said escapement mechanism arranged to permit- .folding movement of said platen carriage frame while maintaining the continuity of saidconnection, and means independent of said connection for operating said escapement mechanism for letter spacing.

4L, In a compactible typewriter, aomain frame, a platen carriage frame pivotally mounted on said main frame for movement into and out of operating position key levers on said main frame, means for connecting said lrey leverswith said escapement mechanism to actuate said escapement mechanism, said connecting me ans having. a joint therein arranged in approximate alinement with the pivotal axis of said platencarriage frame to permit movement of saidhplaten carriage frame while maintaining thereontinnity of said connection, andmeans for operating said escapement mechanism for 1 letter spacing independently of said key levers.

In a folding typewriter,.amain frame I aving a platen carriage frame pivoted thereon for movement .into. and out of. operating posit-ion, escapement mechanism on said platen carriage frame,.key levers on. said main frame,a nonrseparating pivotallyfolding connection. for actuating said escapenient mechanism from said .keylevers, said con nection being arranged tomaintein its continuity during folding. movement, of said platen carriage frame, and letter spacing means for operating said escapementmechanism.

6. In a typewriter, a mainframe, aiplaten carriage frame pivoted thereon,.esc.apen1ent mechanism including a dog rocker mounted on said platen carriage frame, key levers on I said main frame, a folding operative connection between said key levers andsaid platen carriage frame arranged to engage said dog rocker to operate said escapement mechanism, and letter spacing mechanism arranged to engage said dog rocker independently of said foldable connecting means to operate said escapement mechanism for letter spacing.

lever pivotally mounted on said main frame and having one end thereof positioned adjacent the pivotal axis of said plat-en carriage frame, escapement mechanism on said platen carriage frame, and means connected with the said end of said lever for operating said escapement mechanism.

8. In a typewriter, a main frame having a platen carriage frame pivoted thereon, a lever pivotally mounted on said main frame and having one end thereof arranged in approximate alinement with the pivotal axis 7 of said platen carriage frame, key levers on said main frame connected with said lever for operating said lever, escapement mechanism on said platen carriage frame, and a link pivoted to the end of said lever adjacent the pivotal axis of said platen carriage frame for operating said escapement mecha nism when a key lever is-depressed.

9. A typewriter having a main frame with a platen carriage frame mounted thereon, escapement mechanism on said platen car-c riage frame comprising a dog rocker, a bell crank lever on said platen carriage frame, means for moving said dog rocker, a link extending alongsaid platen carriage frame transversely of said typewriter and connecting the operating means for said dog rocker with said bell crank lever, a second link connected with the other arm of said bell crank lever and extending forwardly from said platen carriage frame to a position adjacent the pivotal axis of said frame, and means connected with the forward endof said second link for actuating the same to move said dog rocker.

In testimony whereof I have signed my name to this specification on this 22ndday 50 of August, A.

- OTTO A. HOKANSON. 

